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As odinsravien (aka raven) said, it could be chemical. some kind of soap. But most dish washing products are surfactant based rather than soap. Is your water pretty hard (alot of Calcium and Magnesium)?

surfactant derived from coconut oil and dimethylaminopropylamine.[1] It is a zwitterionic chemical compound with a quaternary ammonium cation. It is a viscous pale yellow transparent liquid and is used as a surfactant in bath ...

... broth are grown in a rich medium on the surface of moist agar. They become multinucleate, elongate, synthesize large numbers of flagella, excrete surfactants, and advance across the surface in coordinated packs. Most studies of swarming have sought to define the developmental processes leading ...